A New Approximant of the Decagonal Quasicrystal and Ultrafine Particles Intercepted and Captured under High Static Pressure
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摘要: 对Al70Co15Ni10Tb5合金进行了静高压（7.0 GPa）熔态（1 700 ℃）淬火（冷却速率1020 C/s）处理，首次观察到一个新十次准晶相关晶体相。该相属底心正交晶体，晶胞参数为a=2.28 nm、b＝1.60 nm、c＝5.46 nm。通过高分辨像分析，给出了它的二维点阵模型。同时在样品中发现了尺寸均匀的纳米级非晶超微粒形成，超微粒为球形，直径30~40 nm。Abstract: In this paper, we reported a new approximant of Al70Co15Ni10Tb5 decagonal quasi-crystal obtained by quenching from melting state (1 700 ℃) under high static pressure (7.0 GPa) for the first time. The approximant is a B-type orthorhombic crystalline phase and its lattice parameters are a=2.28 nm, b=1.6 nm, c=5.46 nm. A two-dimensional lattice model of the approximant is supposed by means of the high-resolution electron microscopy pattern. Besides, many ultrafine particles are found in this sample. They are spherical and their sizes are 30～40 nm.
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